Aren't these essentially pre-configured prompts? I see custom GPTs as helpful, shareable prompt templates. Maybe also a good strategy to convert people to the ChatGPT Pro plan.
I also tried to create a Hacker News GPT that integrates with the HN Algolia API, but had a hard time making it call the correct API endpoints and handle edge cases: https://chat.openai.com/g/g-BIfVX3cVX-hackernews-gpt